I saw long ago an experiment involving simulating changes of speed
using an LED light system and trying to time the clicking of a button ("swinging") to when the light sequence ("pitch") advanced toward "the plate". What I recall is that they found that if there were less than 12 seconds or so between "swings" or "pitches", the batter had little chance due to the residual memory of the pitch before. Maddux was such a quick pitcher, I expect that was part of his success. Pitchers who take their time between pitches actually hurt themselves. And may be why batters take so long between pitches.